I will point out that the Bible is not a good source on the religious practices of other peoples. Current scholarship holds that the things railed against throughout the Old Testament are actually practices that the Israelites practiced before differentiating themselves from the previous Canaanite culture (and the railing against their previous practices was part of that process of differentiation).
Also, current research fails to support the notion of the qadesh as temple prostitutes. The data doesn't support any distinct role, yet does point away from the "sacred prostitute" idea. While there may have been rites that involved sexual content, there's nothing to support the idea of a temple caste existing just for sexual activity.
Rather disappointing for those of us Recons who loved the idea, yet the scholarship doesn't support the notion. (And, yes, I am a Canaanite Reconstructionist.)
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.